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SlotVisitor.h
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91 lines (72 loc) · 2.53 KB
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/*
* Copyright (C) 2011 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef SlotVisitor_h
#define SlotVisitor_h
#include "CopiedSpace.h"
#include "MarkStack.h"
namespace JSC {
class Heap;
class SlotVisitor : public MarkStack {
friend class HeapRootVisitor;
public:
SlotVisitor(MarkStackThreadSharedData&);
void donate()
{
ASSERT(m_isInParallelMode);
if (Options::numberOfGCMarkers == 1)
return;
donateKnownParallel();
}
void drain();
void donateAndDrain()
{
donate();
drain();
}
enum SharedDrainMode { SlaveDrain, MasterDrain };
void drainFromShared(SharedDrainMode);
void harvestWeakReferences();
void finalizeUnconditionalFinalizers();
void startCopying();
void copyAndAppend(void**, size_t, JSValue*, unsigned);
void doneCopying();
private:
void* allocateNewSpace(void*, size_t);
void donateSlow();
void donateKnownParallel()
{
if (!m_stack.canDonateSomeCells())
return;
donateSlow();
}
CopiedBlock* m_copyBlock;
};
inline SlotVisitor::SlotVisitor(MarkStackThreadSharedData& shared)
: MarkStack(shared)
, m_copyBlock(0)
{
}
} // namespace JSC
#endif // SlotVisitor_h